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Self-assembly of bicomponent molecular monolayers: Adsorption height changes and their consequences

AutorGoiri, Elizabeth ; Matena, Manfred; El-Sayed, A.; Lobo-Checa, Jorge ; Borghetti, Patrizia ; Rogero, Celia ; Ortega, J. Enrique ; Oteyza, D. G. de
Fecha de publicación2014
EditorAmerican Physical Society
CitaciónPhysical Review Letters 112(11): 117602 (2014)
ResumenCodeposition of two molecular species [copper phtalocyanine (CuPc, donor) and perfluoropentacene (PFP, acceptor)] on noble metal (111) surfaces leads to the self-assembly of an ordered mixed layer with a maximized donor-acceptor contact area. The main driving force behind this arrangement is assumed to be the intermolecular C-Hâ̄F hydrogen-bond interactions. Such interactions would be maximized for a coplanar molecular arrangement. However, precise measurement of molecule-substrate distances in the molecular mixture reveals significantly larger adsorption heights for PFP than for CuPc. Most surprisingly, instead of leveling to increase hydrogen-bond interactions, the height difference is enhanced in the blends as compared to the heights found in single-component CuPc and PFP layers. The increased height of PFP in mixed layers points to an overall reduced interaction with the underlying substrate, and its influence on electronic properties like the interface dipole is investigated through work function measurements. © 2014 American Physical Society.
DescripciónUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).-- et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.112.117602
Identificadoresdoi: 10.1103/PhysRevLett.112.117602
issn: 0031-9007
e-issn: 1079-7114
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